Listen to Double Violin Concerto in B-Flat Major, RV 524: I. Allegro online. Double Violin Concerto in B-Flat Major, RV 524: I. Allegro is an English language song and is sung by Musici di San Marco and Alberto Lizzio. Double Violin Concerto in B-Flat Major, RV 524: I. Allegro, from the album Focus Your Mind with Vivaldi: 50 Tracks, was released in the year 2015. The duration of the song is 4:31. Download English songs online from JioSaavn.